Lenovo ThinkPad T540p User Manual page 126

• When the key is in the locked position (position 1), the eject button of the docking station is locked, and
you cannot remove your computer. The key lock indicator is on when the eject button is locked.
• When the key is in the unlocked position (position 2), the eject button of the docking station is unlocked,
and you can remove your computer. The key lock indicator is off when the eject button is unlocked.
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User Guide